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• W2059630140 abstract "Raman, 27Al and 29Si NMR spectroscopies are used to investigate the structure of [0.15Na2O–0.12MgO–0.03Al2O3–0.70SiO2](100−x): [Eu2O3]x glasses with varying Eu2O3 content (x=0, 0.73, 1.26, 3.90, 5.26 and 8.11 mol%). Spectral changes in the Raman envelope at (900–1240) cm−1 indicate that the number of silica tetrahedra with more than one non-bridging oxygen (NBO) per tetrahedron and the number of silica tetrahedra with one NBO associated with Eu increase with increasing rare-earth concentration. 29Si MAS NMR spectra show a single broad peak with maxima at frequencies attributable to a predominance of Q3 species. Quantitative 27Al and 29Si NMR spectroscopies show that aluminum and silicon species become less observable as Eu2O3 content increases, presumably due to interactions with paramagnetic europium. The 27Al NMR spectra reveal the presence of only tetrahedrally coordinated Al sites, with a gradual increase in the structural disorder associated with these sites as the concentration of Eu2O3 increases. This is in agreement with the appearance of the broad Raman band at 790 cm−1 attributed to Al–O stretching vibrations with Al in fourfold coordination." @default.
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• W2059630140 date "2003-01-01" @default.
• W2059630140 modified "2023-09-24" @default.
• W2059630140 title "Structural characterization of Eu2O3–MgO–Na2O–Al2O3–SiO2 glasses with varying Eu2O3 content: Raman and NMR studies" @default.
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• W2059630140 doi "https://doi.org/10.1016/s0022-3093(02)01594-6" @default.
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